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In page Atypical trigeminal neuralgia:

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ATN is usually attributed to inflammation or demyelination, with increased sensitivity of the trigeminal nerve. These effects are believed to be caused by infection, demyelinating diseases, or compression of the trigeminal nerve (by an impinging vein or artery, a tumor, dental trauma, accidents, or arteriovenous malformation) and are often confused with dental problems. Though TN and ATN most often present in the fifth decade, cases have been documented as early as infancy.[citation needed]